Massive 6.7 magnitude aftershock Miyaki coast, Japan - NO reports of damage or injuries

Earthquake overview : During the morning hours (Japan local time) a massive 6.7 magnitude earthquake occurred approx. 50 km out of the Iwate, Miyaki coast, a coastline which has been hardly hit by the March 11 tsunami disaster. To read the full story as it happened, we advise our readers to start at the bottom of the page (earthquake data) and to continue going up.  It will read as a written movie of the events.

Coastal view closest to the June 23 aftershock - Panoramio picture by Satoh Junpei -

UPDATE  23/06 - 07:07UTC : We have the pleasure to report that after checking our many sources, NO damage or injuries have been reported for this earthquake.

UPDATE  23:28 UTC : The coastal area closest to the epicenter is a very rough rocky coast.

UPDATE  23:28 UTC : We keep the Moderately dangerous status for this aftershock as the seismologists of USGS have recalculated the epicenter. The new location is approx. 20 km out of the coast. The current location may be damaging for the coastal villages. We are awaiting the FDMA report (Fire Department) for detailed data.

UPDATE  23:23 UTC : Contrary to what we normally do, we are not giving any MMI values from USGS because in Japan we use the local JMA Intensity values. The system has proofed to be highly accurate.

UPDATE  23:16 UTC : USGS has received a max. Felt MMI value of V (moderate shaking).  The aftershock was also felt in Hokkaido.

UPDATE  23:12 UTC : As the distance to Tokyo is more than 500 km, people in Tokyo will certainly have felt this earthquake, but far less than some of the other aftershocks which occurred the last several weeks.

UPDATE  23:11 UTC : So far we have NOT received any QuakeSOS alert signals which confirms our earlier prediction.

UPDATE  23:06 UTC : As expected we have no reports of any damage or injuries as of this moment. We do not expect that apart from some minor issues, damage reports will be published

UPDATE  23:00 UTC : It will be hard for the Japanese people that the misery of the continuous aftershocks will start over again. The last couple of weeks, they were happy that there were almost no serious aftershocks anymore. This massive aftershock will surely start another session of moderate to strong aftershoks.

UPDATE  22:51 UTC : All tsunami warnings and advisories have been canceled.

UPDATE  22:43 UTC : As you are able to see on the GDACS tsunami simulation map, people living on the Miyaki coast are helpless against an eventual big tsunami if it should occur on this location. The damaging waves would land on the coast within 15 minutes from the initial quake.

UPDATE  22:40 UTC : Based on our extensive following of the aftermath of this earthquake since March 11, Earthquake-Report calls this massive aftershock only moderately dangerous.  The max. tsunami wave of 0.7 meter will not be damaging.

UPDATE  22:37 UTC : Luckily for the Iwate people, this earthquake occurred under the seabed? If the epicenter would have been below land, this aftershock would have been very damaging.

UPDATE  22:29 UTC : GDACS has calculated that the max. wave height would be 0.7 meter in the following locations :

UPDATE  22:26 UTC : Generally we can speak of a massive earthquake at this magnitude. It is of course far less than the 9.0 which killed so many people on March 11, but because of the location a lot closer to the coast it would be dangerous even at lesser magnitudes.

UPDATE  22:21 UTC : JMA 5- (highest intensity values for this aftershock) have been experienced in :  Aomori-ken Sampachi-Kamikita, Aomori-ken Shimokita, Iwate-ken Engan-hokubu, Iwate-ken Nairiku-hokubu

UPDATE  22:20 UTC : Other seismological station values in the world :
JMA (Japan) : 6.7 @ 20 km
EMSC (Europe) :  6.8 @ 40 km
GFZ (Germany) : 6.7 @ 33 km

UPDATE  22:15 UTC : This aftershock is by fat the strongest since many weeks. the epicenter location is relatively close to the coast.

UPDATE  22:13 UTC : JMA has a Tsunami advisory in place for the Iwate prefecture
The tsunami height is not expected to be higher than 0.5 meter

We are currently collecting data
JMA predicts an 5-intensity
A 5- intensity JMA shaking is very strong, but normally not damaging. uses 5+ as an alarming level.

Most important Earthquake Data:
Magnitude : 6.7
UTC Time : Wednesday, June 22, 2011 at 21:50:00 UTC
Local time at epicenter : Thursday, June 23, 2011 at 06:50:00 AM at epicenter
Depth (Hypocenter) : 20 km
Geo-location(s) :
approx. 50 km from Miyako
108 km (67 miles) SE (128°) from Hachinohe, Honshu, Japan
529 km (329 miles) NNE (26°) from TOKYO, Japan

Links to important maps
USGS Did You Feel It Map
Google satellite map of the area showing the kind of terrain the earthquake took place
USGS historic earthquakes map
USGS Seismic hazard map
USGS Impact on Population map (Pager)
USGS Shaking map
GDACS GREEN earthquake report
GDACS tsunami report
JMA Tsunami advisory report

QuakeSOS+ and QuakeSOS free are iPhone applications developed by Armand Vervaeck, the founder of Earthquake Report. The Application simplifies immediate group communication to friends and family members (with your exact GPS location) and is feeding the users with Earthquake Report news.
The 0.99 US$ QuakeSOS+ version will support the activities of SOS Earthquakes.

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I did feel it – Ik heb het gevoeld – Το έκανα αισθάνεται – Yo lo siento – 我的确感到了 – 私はそれを感じていました- Ich habe es gefühlt – Bunu hissediyorum yaptı – لم أشعر أنه